Malicious PDF — malware analysis report

Static analysis result for SHA-256 727a08270837c4d5…

MALICIOUS

PDF

43.1 KB Created: 2020-11-06 17:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a521a8c42eb90c7382a8c66ddb6235b9 SHA-1: e3566136c6ed131ade031238acb3fb6f14248361 SHA-256: 727a08270837c4d55c72365d6db6dfa8e2dc5006ba0197f90dad0fd6d57b8e84
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a direct link to a known malicious redirector, indicating an attempt to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=martin+guitar+forums+acoustic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f8b2a7725420.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/sobofopamifefok_rasik_lefivegifab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5f99689e7109b.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/155e4ff.pdfIn PDF document text
    • https://jopulovi.weebly.com/uploads/1/3/4/2/134265775/wepokisu.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/lanadez.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/relazefomatuwu-kozakep-bufegurun.pdfIn PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/magibelu-pokud-bixitufaguzapi-baraxoxa.pdfIn PDF document text
    • https://mibonapa.weebly.com/uploads/1/3/4/3/134308174/3394764.pdfIn PDF document text
    • https://kukajuma.weebly.com/uploads/1/3/4/3/134380089/silewoxupape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://denenuso.files.wordpress.com/2020/11/rokinovexelapuk.pdfIn PDF document text
    • https://gakibarum.files.wordpress.com/2020/11/88938693861.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/baniwisezexefosu.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/25792747394.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/dallas_high_school_mascot.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/35507020803.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/95682682803.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F9 5172 bytes
SHA-256: be899ed09f910feb6f943106f498e0d21323ff1336c4f237c1f80bb56972ef8d
font_01_sfnt_off00007993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7993 10988 bytes
SHA-256: f46bd3ca3ed3864e7bf6b1b7c47da16ba6d3c707b3c82dc579963a7428171d76

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